What I find funny about Tyron and Khabib is that neither of them feel particularly confident about the match up against each other, but Khabib is coming at it from a place of realism and probability when it comes to the weight, while Tyron is coming at it from a place of Humor, hence his line about Khabib wrestling bears, and how he'd rather fight GSP.
I don't think neither of them are afraid, but they both don't want the fight for different reasons, Khabib's reasoning is more grounded however and makes sense. Tyron's kinda playing it off jokingly.
Very interesting.